diff options
| author | Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com> | 2024-05-13 16:08:10 +0530 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-06-03 11:18:51 +0200 |
| commit | 02ecee07ca30f76f2a0f1381661a688b8e501ab0 (patch) | |
| tree | 789b1fab4a4398e4265070085ef3c9a378282def /include/linux/timekeeping.h | |
| parent | 0f532a789f1b24258043d0f856409d2ab974fb64 (diff) | |
timekeeping: Add function to convert realtime to base clock
PPS (Pulse Per Second) generates a hardware pulse every second based on
CLOCK_REALTIME. This works fine when the pulse is generated in software
from a hrtimer callback function.
For hardware which generates the pulse by programming a timer it is
required to convert CLOCK_REALTIME to the underlying hardware clock.
The X86 Timed IO device is based on the Always Running Timer (ART), which
is the base clock of the TSC, which is usually the system clocksource on
X86.
The core code already has functionality to convert base clock timestamps to
system clocksource timestamps, but there is no support for converting the
other way around.
Provide the required functionality to support such devices in a generic
way to avoid code duplication in drivers:
1) ktime_real_to_base_clock() to convert a CLOCK_REALTIME timestamp to a
base clock timestamp
2) timekeeping_clocksource_has_base() to allow drivers to validate that
the system clocksource is based on a particular clocksource ID.
[ tglx: Simplify timekeeping_clocksource_has_base() and add missing READ_ONCE() ]
Co-developed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Co-developed-by: Christopher S. Hall <christopher.s.hall@intel.com>
Signed-off-by: Christopher S. Hall <christopher.s.hall@intel.com>
Signed-off-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240513103813.5666-10-lakshmi.sowjanya.d@intel.com
Diffstat (limited to 'include/linux/timekeeping.h')
| -rw-r--r-- | include/linux/timekeeping.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index b2ee182d891e..fc12a9ba2c88 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -318,6 +318,10 @@ struct system_counterval_t { bool use_nsecs; }; +extern bool ktime_real_to_base_clock(ktime_t treal, + enum clocksource_ids base_id, u64 *cycles); +extern bool timekeeping_clocksource_has_base(enum clocksource_ids id); + /* * Get cross timestamp between system clock and device clock */ |